Pinpointer with discrimination "Cat-FM" on ATMega328P

[useus]

follow this pattern otherwise you may have the same problems I had



it remains to understand which 33nf capacitor to use, the one I use at the moment is the most stable with temperature changes but I have to find a better one, I have no idea which model to use

[MartyJ1963]

Hi Useus. Have you tried this little circuit? It is a Passive piezo driver circuit. The C8550 Can be substituted for BC557. Regards, Marty

[useus]

Hi Useus. Have you tried this little circuit? It is a Passive piezo driver circuit. The C8550 Can be substituted for BC557. Regards, Marty

You don't need this circuit on cat fm

[MartyJ1963]

Ok, but I bought the same passive piezo as the one used and linked by Void118 and I can't get it to work? There are 3 terminals on it. GND, VCC AND I/O. When I connect the GND and VCC to the Cat fm,,,,nothing? Where shoud the I/O be connected please? Regards, Marty.

[useus]

Ok, but I bought the same passive piezo as the one used and linked by Void118 and I can't get it to work? There are 3 terminals on it. GND, VCC AND I/O. When I connect the GND and VCC to the Cat fm,,,,nothing? Where shoud the I/O be connected please? Regards, Marty.

Vcc on bat+
I/o you need connect this to atmega328 sound pin

[MartyJ1963]

Thanks Useus. I am not certain which pin of the ATmega328P-PU is the sound pin? Thanks, Marty.

[useus]

Thanks Useus. I am not certain which pin of the ATmega328P-PU is the sound pin? Thanks, Marty.

See schematic or my pcbs in previous posts

[useus]

Thanks Useus. I am not certain which pin of the ATmega328P-PU is the sound pin? Thanks, Marty.

See schematic or my pcbs in previous posts

[jeep6789]

What is the purpose of this thread? Can it be used as a detector? Still use it as a radio

[void118]

What is the purpose of this thread? Can it be used as a detector? Still use it as a radio

We are discussing fishing here, but we can talk a little about radio

[walkman]

Special Thanks

Thanks to void118 for bringing the project to the forum.



My test videos. Have a good time.

https://www.youtube.com/watch?v=DCyV...X8fJzhN4AaABAg

[void118]

Thanks to void118 for bringing the project to the forum.
[ATTACH]55326[/ATTACH]

My test videos. Have a good time.

https://www.youtube.com/watch?v=DCyV...X8fJzhN4AaABAg

Thank you my friend, very nice design and great coil!

[jeep6789]

Can anyone send some MP4 to the forum? Many thanks

[zakari]

hi all
whats the fuse bit for programing atmega328p-pu?
best regard
zakari

[void118]

hi all
whats the fuse bit for programing atmega328p-pu?
best regard
zakari

Hi, you can find fuse bits settings on the schematic page.